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NJM2794 ? 1 ? ground noise isolation amplifier general description the NJM2794 is a ground noise isolation amplifier designed for car audio system. it contains dual channel differential amplifier. it is developed for those car audio applications where long connections between head unit and other components are necessary and ground noise has to be eliminated. features dual channel differential amplifier operating voltage 4.3 to 13v operating current 14ma typ. common mode rejection ratio cmrr=60db typ. maximum output voltage 2vrms min., @ thd=0.1% supply voltage rejection ratio 60db typ. total harmonic distortion 0.002% typ. noise output voltage 1.3 vrms typ. bipolar technology package outline msop10 (tvsp10)* ssop14 *meet jedec mo-187-da / thin type block diagram package outline NJM2794v (ssop 1 4) NJM2794rb2 msop 1 0 (tvsp 1 0) out2 out 1 in 1 - in 1 + in2+ in2- vref gnd v+
NJM2794 ? 2 ? pin configuration msop 1 0(tvsp 1 0) ssop 1 4 11 0 6 5 no. symbol function 1 out1 output1 2 gnd ground 3 vref reference voltage 4 v+ power supply 5 out2 output2 6 in2+ +input2 7 in2- -input2 8 nc no connect 9 in1- -input1 10 in1+ +input1 11 4 8 7 no. symbol function 1 out1 output1 2 nc no connect 3 gnd ground 4 vref reference voltage 5 v+ power supply 6 nc no connect 7 out2 output2 8 in2+ +input2 9 nc no connect 10 in2- -input2 11 nc no connect 12 in1- -input1 13 nc no connect 14 in1+ +input1
NJM2794 ? 3 ? absolute maximum ranges (ta=25c) parameter symbol range unit supply voltage v + +15 v maximum input voltage v im 0 to v + ( ? ) v power dissipation p d msop10(tvsp10) : 530* ssop14 : 550* note: eia/jedec standard test board (76.2x114.3x1.6mm, 2layer, fr-4) mounting mw operating temperature topr -40 to +85 c storage temperature tstg -40 to +150 c ( ? ) for the maximum input voltage less than 0 tov + electrical characterristic (v + =9v,ta=25c) parameter symbol test condition min. typ. max. unit dc characterristic operating voltage v + 4.3 9 13 v operating current i cc no signal - 14 20 ma reference voltage v ref 3.8 4.3 4.8 v ac characterristic (non-inverting circuit, f=1khz, vin=1vrms, r g =0 ? , r l =10k ? unless otherwise specified ) voltage gain gv -1.0 0.0 +1.0 db channel separation cs f=1khz 90 110 - db channel balance bal - - 0.5 db roll-off high frequency f rh -1db 100 - - khz input resistance r in 85 105 125 k ? output resistance r out - 90 - ? maximum output voltage 1 v om1 thd=0.1%, f = 1khz 2 2.5 - vrms maximum output voltage 2 v om2 thd=0.1%, f = 1khz, v + =8v 1.7 2.1 - vrms maximum output voltage 3 v om3 inverting, thd=0.1%, f = 1khz - 2.5 - vrms maximum output voltage 4 v om4 inverting, thd=0.1%, f = 1khz, v + =8v - 2.1 - vrms noise output voltage v no rg=600 ? , a-weighted - 1.3 2.5 vrms total harmonic distortion thd f=1khz , v o =1vrms, bw=400hz to 30khz - 0.002 0.01 % common mode rejection ratio cmrr 50 60 - db common mode input voltage vicm cmrr=50db - 2 - vrms supply voltage rejection ratio svr f=100hz , v ripple =100mvrms 55 65 - db
NJM2794 ? 4 ? ? ? ? ? terminal description pin no. tvsp 1 0 ssop 1 4 symbol function equivalent circuit terminal dc voltage 1 5 1 7 out1 out2 output1 output2 v + x0.48 [v] 6 7 9 10 8 10 12 14 in2+ in2- in1- in1+ +input2 -input2 -input1 +input1 v + x0.48 [v] 3 4 vref reference voltage v + x0.48 [v] 100 ? fb v+ v+ 100 ? 240k ? 260k ? v+ v+ v+ 50 ? 105k ? vre f
NJM2794 ? 5 ? application circuit msop10(tvsp10) : NJM2794rb2 ssop14 : NJM2794v out 1 out2 in 1 + in2+ 1 2 3 4 5 1 0 8 7 6 + + + + + + 10 f 3.3 f 3.3 f 0.33 f 0.33 f out 1 in 1 + in2+ out2 v+ v+ 22 f vref gnd in 1 - 9 + 0.33 f in 1 - in2- + 0.33 f in2- nc nc 2 3 4 5 6 1 3 11 1 0 9 + + 10 f nc nc nc v+ v+ 22 f vref gnd in 1 - 1 2 + 0.33 f in 1 - in2- + 0.33 f in2- nc out 1 1 + 3.3 f out 1 in 1 + 1 4 + 0.33 f in 1 + out2 in2+ 7 8 + + 3.3 f 0.33 f in2+ out2
NJM2794 ? 6 ? application block diagram (1) non-inverting line input ic gnd in+ in- NJM2794 out vref v n ic gnd in+ in- NJM2794 out vref v n ic gnd in- in+ NJM2794 out vref v n ic gnd in- in+ NJM2794 out vref v n (2) inverting line input (3) non-inverting line output (4) inverting line output
NJM2794 ? 7 ? typical characteristics operating current vs. ambient temperature v+=9v 0 5 10 15 20 25 30 -50 -25 0 25 50 75 100 125 150 ambient temperature [ o c] operationg current [ma] reference voltage vs. ambient temperature v+=9v 0 3 6 9 12 15 -50 -25 0 25 50 75 100 125 150 ambient temparature [ o c] reference voltage [v] operating current vs. operating voltage 0 5 10 15 20 25 30 03691215 operating voltage [v] operating current [ma] 25 o c ta=85 o c -40 o c reference voltage vs. operating voltage 0 3 6 9 12 15 03691215 operating voltage [ v] reference voltage [v] ta=85,25,-40 o c noise output voltage vs. ambient temperature v+=9v, rg=600 ? , a-weighted -140 -120 -100 -80 -60 -40 -20 0 -50 -25 0 25 50 75 100 125 150 ambient temperature [ o c] noise output voltage [dbv] noise output voltage vs. signal source resistance v+=9v, ta=25 o c, a-weighted -120 -100 -80 -60 -40 -20 0 0.01 0.1 1 10 100 signal source resistance [k ? ] noise output voltage [dbv]
NJM2794 ? 8 ? typical characteristics channel separation vs. ambient temperature v+=9v, rg=600 ? , vin=1vrms, bw=400hz-30khz -120 -100 -80 -60 -40 -20 0 -50 -25 0 25 50 75 100 125 150 ambient temperature [ o c] channel separation [db] in1+ -> out2 thd+n vs. output voltage v+=9v, f=1khz, non-inverting circuit 0.001 0.01 0.1 1 0.01 0.1 1 10 output voltage [vrms] thd+n [%] ta=25,85 o c ta=-40 o c thd+n vs. output voltage v+=9v, f=1khz, inverting circuit 0.001 0.01 0.1 1 0.01 0.1 1 10 output voltage [vrms] thd+n [%] ta=-40,25,85 o c channel separation vs. frequency v+=9v, rg=600 ? , vin=1vrms, bw=10hz-30khz -120 -100 -80 -60 -40 -20 0 10 100 1000 10000 100000 frequency [hz] channel separation [db] in2+ -> out1 in1+ -> out2 thd+n vs. output voltage v+=8v, f=1khz, non-inverting circuit 0.001 0.01 0.1 1 0.01 0.1 1 10 output voltage [vrms] thd+n [%] ta=25,85 o c ta=-40 o c thd+n vs. output voltage v+=8v, f=1khz, inverting circuit 0.001 0.01 0.1 1 0.01 0.1 1 10 output voltage [vrms] thd+n [%] ta=-40,25,85 o c
NJM2794 ? 9 ? typical characteristics thd+n vs. output voltage v+=9v, ta=25 o c, inverting circuit 0.001 0.01 0.1 1 0.01 0.1 1 10 output voltage [vrms] thd+n [%] f=100hz, 1khz,10khz thd+n vs. output voltage v+=9v, ta=25 o c, non-inverting circuit 0.001 0.01 0.1 1 0.01 0.1 1 10 output voltage [vrms] thd+n [%] f=100hz, 10khz f=1khz thd+n vs. output voltage v+=9v, vin=1vrms, bw=22hz-80khz, non-inverting circuit 0.001 0.01 0.1 1 10 100 1000 10000 100000 frequency [hz] thd+n [%] ta=-40,25,85 o c thd+n vs. output voltage v+=9v, vin=1vrms, bw=22hz-80khz, inverting circuit 0.001 0.01 0.1 1 10 100 1000 10000 100000 frequency [hz] thd+n [%] ta=-40,25,85 o c maximum output voltage vs. operating voltage f=1khz, thd=0.1%, non-inverting circuit 0 1 2 3 4 03691215 operating voltage [v] maximum output voltage [vrms] ta=-40,25,85 o c maximum output voltage vs. operating voltage f=1khz, thd=0.1%, inverting circuit 0 1 2 3 4 03691215 operating voltage [v] maximum output voltage [vrms] ta=-40,25,85 o c
NJM2794 ? 10 ? typical characteristics voltage gain vs. frequency v+=9 v, vi n =1 vrm s , ta =2 5 o c -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1000 10000 100000 frequency [hz] voltage gain [db] non-inverting circuit, inverting circuit maximum output voltage vs. load resistance v+=9v, f=1khz, ta=25 o c, bw=400 - 30khz 0 1 2 3 4 5 0.1 1 10 100 load resistance [k ? ] maximum output voltage [vrms] v+=13v 9v 4.3v thd=0.1% supply voltage rejection ratio vs. frequency v+=9v, vripple=100mv, rg=600 ? , ta=25 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 frequency [hz] supply voltage rejection ratio [db] c ref =4.7 f c ref =22 f c ref =10 f reference voltage turn-on behaviour v+=9v, ta=25 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 012345678910 tim e [s ec] reference voltage [v] c ref =4.7 f c ref =22 f c ref =10 f supply voltage rejection ratio vs. operating voltage vripple=100mv, f=100hz, rg=600 ? , ta=25 o c -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 03691215 operating voltage [v] supply voltage rejection ratio [db] supply voltage rejection ratio vs. signal source resistance v+=9v, vrippple=100mv, f=100hz, ta=25 o c -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 0.1 1 10 100 signal source resistance [k ? ] supply voltage rejection ratio [db]
NJM2794 ? 11 ? typical characteristics [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. common mode rejection ratio vs. input voltage v+=9v, f=1khz, ta=25 o c, bw=400 - 30khz -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 0.001 0.01 0.1 1 10 input voltage [vrms] common mode rejection ratio [db] ta=-40 o c 85 o c 25 o c common mode rejection ratio vs. frequency v+=9 v, vi n =1 vrm s -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 frequency [hz] common mode rejection ratio [db] ta=-40 o c 25 o c ta=85 o c

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